<html><!-- -->
    <head>

    </head>
    <body>
        <h1>This is a heading</h1>
        <h2>This is a subheading</h2>
        h1, h2, h3, h4, h5, and h6 是标题标签.
        <p>
            This is a paragraph.
        </p>
        <p>
            This is another paragraph.
        </p>
        p 是段落标签.p之间会间隔一行
        <br>
        换
        <br> 
        行
        <br>
        br是换行标签.
        <hr> hr是水平线标签.
       <h2>文本格式化标签</h2>
        <strong>This is strong text</strong>=<b>This is bold text</b>
        <br>
        <em>This is emphasized text</em>=<i>This is italic text</i>
        <br>
        <ins>This is underlined text</ins>=<u>This is underlined text</u>
        <br>
        <del>This is strikethrough text</del>=<strike>This is strikethrough text</strike>
        <br>
        <img src="https://www.w3schools.com/html/img_mountains.jpg" alt="Mountains" title="Mountains" width="500" height="300">
        src是图片的地址,alt是无法显示时的替代文字,title是鼠标悬停时的提示文字,width和height是图片的宽度和高度.
        <br>
    </body>
</html>